I.S.HD 384.4.442 S1:1998

Introduction
442.1 General
      442.1.1 Scope and object
      442.1.2 Power-frequency stress-voltage
      442.1.3 Normative references
      442.1.4 Symbols
442.2 Earthing arrangements in transformer sub-stations
442.3 Earthing arrangements with regard to type of earthing
      systems in low-voltage system
      442.3.1 TN-systems
      442.3.2 TT-systems
      442.3.3 IT-systems
442.4 Power-frequency stress-voltage in low-voltage equipment
      of transformer sub-stations
      442.4.1 TN- and TT-systems
      442.4.2 IT-systems
442.5 Stress-voltage in case of loss of the neutral conductor
      in a TN or TT system
442.6 Stress-voltage in case of accidental earthing of an IT
      system
442.7 Stress-voltage in case of a short-circuit between a
      line conductor and the neutral conductor
Annex A (informative) Clause 9 of prEN 50179 - Earthing systems
Annex B (informative) A-deviations

Gives requirements for the safety of persons and equipment in the low-voltage installation in the event of a fault between the high-voltage system and earth in the transformer sub-station which supplies the low-voltage installation.